A star contains

A. about 75% of hydrogen

B. 22% helium

C. traces of most other elements including oxygen, neon, carbon and nitrogen

D. All the above

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. The ozone layer absorbs
  2. The escape velocity of a satellite projected from the surface of the earth is independent of
  3. Sun spots are
  4. In compact porous soil, the rising of the water is due to
  5. When we sweat, we feel comfortable under a fan because
  6. An ohm is a unit of
  7. Increase in pressure
  8. In a refrigerator cooling is produced by
  9. What la the minimum velocity required for a rocket to overcome earth's gravity and travel into space?
  10. The brightest star visible to the naked eye is
  11. X-rays were discovered by
  12. Which of the following is not electromagnetic waves?
  13. The stars that shine brightly then dimly and then brightly are known as
  14. A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field…
  15. The filament used in the electric lamp is made of
  16. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks…
  17. The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than…
  18. The strength of an electromagnet can be increased by
  19. A piece of cork la embedded inside an ice block which floats in water. What will happen to the level…
  20. The tiniest of the stars belong to the group known as
  21. A lactometer la used to
  22. Galaxies emit
  23. A body has fallen from a height. Just before touching the pound it has
  24. In a hydraulic pressure
  25. The colour of a star is an indication of its
  26. The Solar System lies near the edge of a galaxy known as
  27. If you want a sound proof room, the walls should be
  28. If a band is played on the moon the sound will
  29. Thick brick walls are used in the construction or a cold storage because bricks
  30. The planet with the reddish tinge is